<template>
    <div class="list" ref="wrapper">
        <div>
            <div class="area">
           <div class="title border-topbottom">当前城市</div>
           <div class="button-list">
               <div class="button-wrapper">
                   <div class="button">{{ this.currentCity }}</div>
               </div>
           </div>
       </div>
      <div class="area">
           <div class="title border-topbottom">热门城市</div>
           <div class="button-list">
               <div class="button-wrapper"
                v-for="item of hot" 
                :key="item.id"
                @click="handleCityClick(item.name)"
                >
                   <div class="button">{{ item.name }}</div>  
               </div>
           </div>
       </div>
       <div class="area" 
       v-for="(item, key) of cities" 
       :key="key"
       :ref="key"
       >
           <div class="title border-topbottom">{{ key }}</div>
           <div class="item-list">
               <div class="item border-topbottom"
               v-for="innerItem of item"
               :key="innerItem.id"
                @click="handleCityClick(innerItem.name)"
               >
               {{ innerItem.name }}
               </div>
           </div>
       </div>
       </div>
    </div>
</template>
<script>
import Bscroll from 'better-scroll'
import { mapState,mapMutations } from 'vuex'
export default {
    name:'CityList',
    props:{
        hot:Array,
        cities:Object,
        letter:String
    },
    methods:{
        handleCityClick(city){
            this.changeCity(city)
            this.$router.push('/')
        },
        ...mapMutations(['changeCity'])
    },
    mounted(){
        this.scroll = new Bscroll(this.$refs.wrapper)
    },
    computed:{
        ...mapState({
            currentCity:'city'
        })
    },
    watch:{
        letter(){
            if(this.letter){
                const element= this.$refs[this.letter][0]
                this.scroll.scrollToElement(element)
            }
        }
    }
}
</script>
<style lang='stylus' scoped>
 @import '~styles/varibles.styl'
 .border-topbottom
    &:before
        border-color #ccc
    &:after
        border-color #ccc
    &:before
        border-color #ccc
.list
    overflow hidden
    position absolute
    top 1.58rem
    left 0
    right 0
    bottom 0
.title
    line-height .5rem
    background #eee
    padding-left .2rem
    color #666
    font-size .26rem
.button-list
    overflow hidden
    padding .1rem .6rem .1rem .02rem
.button-wrapper
    float left
    width 33.33%
.button
    text-align center
    margin .1rem
    padding .1rem 0
    border .02rem solid #ccc
    border-radius .06rem
.item-list
    .item
        line-height .76rem
        padding-left .2rem
</style>
